claude fix: improve product scraping and debugging features

backend/app/main.py

@@ -44,5 +44,11 @@ def health() -> dict[str, str]:
     return {"statut": "ok"}
 
 
+@app.get("/version")
+def version() -> dict[str, str]:
+    """Retourne la version du backend."""
+    return {"version": "0.1.0"}
+
+
 def main() -> FastAPI:
     return app